Abrading-machine.



E. NALL.

ABRADING MACHINE- APPLICATHJN FILED szPLzz. 19:6.

Patented Nov. 26, 1918;

2 SHEETS-SHEET 1.

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E. NALL.

RADING MACHINE.

APPLICATION man SEPT, 22, 1915.

Patented Nov. 26, 1918 2 SHEETS-SHEET 2- wwwwsh Edward Nall.

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UNITED srnrnsrnannr canton EDWARD NALL, OF AKRON, OI-IIO, ASSIGNOR TOTHE GOODYEAR TIRE & RUBBER COMPANY, OF AKRON, OHIO, A CORPORATION OFOHIO.

ABRADING-MAOHINE.

. Specification of Letters Patent. I Patented NOV. 26, 1918.

Application filed September 22, 1916. Serial No. 121,616.

T 0 all whom it may concern:

Be it known that I, EDWARD NALL, a citiface and of stationary feedingmeans which" feed the material to be ground gradually to' the abrasivedisk and simultaneously over all portions of its surface.

An object of equal importance with the foregoing is to provide anexhaust channel in connection with a stationary feeding means for thedisk such that the pulverized material may be readily drawn ofl thesurface of the abrading disk as fast as it ac cuinulates without,however, being accompanicd' by unground or only partially groundmaterial.

The above and additional objects of a.

similar nature, which will be hereinafter more specifically treated, maybe accomplished by such means as are illustrated in the accompanyingdrawings, described in the following specification and. then moreparticularly pointed out in the claims which are appended hereto andform a part of this application.

With reference to the drawings,'wherein there has been illustrated apreferred empractice, and throughout the several views of which, similarreference numbers desig-fl nate corresponding parts;

Figure 1 is a view in side elevation ofthe abrading machine comprehendedby this present invention, parts being sectionalized;

and

Fig. 2 is a plan view of the machine :shown in Fig. 1.

is that which employs but a single abrasive disk, yet machines of thischaracter are wastefully slow unless the material to be ground issimultaneously fed to all portions of its surface. It is to thestationary means for gradually feeding masses of rubber or chunks ofother materials to the single rotatable disk that the present inventionpertains. My invention is also concerned with a means for withdrawingthe pulverized material without scattering, and without also withdrawingfrom the machine quantities of the material in a partially powderedstate.

' As shown, the abrading -macliine comprises a table 5 provided with arim channel 6 for the exhaust of the powdered material; a centerpedestal -7 supporting the table; a

A rotatable abrasive disk 8 mounted for movement upon thejpedestal 7 andhaving its peripheral edge extending over the exhaust channel 6; and acompartment cover plate 9 which issupported upon the rim channel ofthetable and entirely incloses the grinding disk. The compartments" 10of this cover 9 may be of any desired number to provide a number ofstations for feeding portions of the material to be ground to all partsof the abrading disk simultaneously, yet independently.

The base of the pedestal 7 is formed hollow, as indicate'd by thenumeral 11, in

order that an operating gear 12 may be mounted upon the dependent stem13 of the {disk 8, the stem 13 being inolosed in suitable bearings 14.Meshing with the oper- Qating gear 12 isthe beveled gear 15 which 7 I iscarried-,at theextremity of a shaft 16 bodiment of the invention as itis reduced to 11601110113117 with the drive shaft 18 of an ..ele0t.ricmotor 1 9,]0r other; primemover. :Also mounted upon the shaft 16 andadapted having suitable belt and pulley drive conto be driven by themotor 191is a pulley 2 0 which operates, through a belt or otherconnection, the shaft 21 of a suitable exhaust blower indicatedgenerally by the numeral 22. I

The rimchannel 6 of the table is entirely inclosed :and is supported by.angular arms 23'. which radiate, from the pedestal 7. Starting at thepoint indicated by the numeral 24, this rim channel proceeds in ahorizontal plane entirely around the table, in creasing its sectional diensi ns 1 P portion to the distance from the starting point 24 The endof this channel is formed into a flaring mouth. 25 where it laps thestarting point 24, and such mouth is connected by the downwardly jointedpipe with the axis of the blower 22. A constantsuction is thus providedcompletely around the rim channel 6, while the increasing dimensions ofthe channel take care of the increasing amount of pulverized materialdrawn from the grinding disk 8 as the draft progresses from the startingpoint 2st of the rim channel to the blower. A suitable exhaust 22 fromthe blower to a storing rece jitacle is, of course, provided, al thoughnot specifically illustrated in this connection. Suit-able apertures areformed at. regula intervals along the top wall of the exhaust channel 6to permit the exhaust draft to act upon pulverized particles of thematerialcarried by the edge of the revolv ing disk 8 whose path oftravel is above the openings 26.

The compartment cover 9 has a circular vertical rim portion which issecured by suitable means 27, of a removable nature, upon the rim of thetable 5 in such manner as to define an inclosing chamber for the grinder8. which chamber is in direct communication with the channel 6 throughthe exhaust apertures 26. Extending from the center of the table to thecircular rim portion of the cover 9 are a plurality of tangentialvertical vane walls 29 the lower ends of which are adjacent to theabrasive disk 8, and from each of these walls there slopes a surface 30downwardly toward the lower end of the next vane. in the direction ofrotation of the grinding disk 8. Each of these surfaces 30 approaches,at its lowermost end, to within a short distance of the surface of theabrading disk and is formed with a feeding aperture 31. Cover plates ordisks 32 are secured to handle bars 83 to form closures for the feedingaperture, each of the handle bars being formed with a pair of oppositelydirected arcuate slots 34; in its opposite extremities for a removableengagement with pins 35 projecting upwardly from the surface 30 andsituated on a diameter of the respective feeding hole 31. The turning ofthe cover plates through a small arc is sufficient to either lock themin their position over the feeding holes or to unlock them when it isdesired to feed additional material into the grinding compartment.

In addition to the vane walls 29, I have provided a number of separatepartitions 36, one of which may be removably secured to each vane wallthrough the medium of fastening means 37 for the purpose of preventingpassage of any of the ground material between adjacent compartments.

In operation, the abrading disk is rotated by the motor 19 in aclockwise direction (Fig. 2) and the operator feeds chunks of the rubberwhich is to be reclaimed, or other material to be ground, into each ofthe compartments defined by the vanes 29. The cover disks 82 are thenlooked over the feeding holes and the entire surface of the revolvingdisk is thus employed. As the initially large masses of rubber are heldagainst rotation by the stationary curved surface 30 of each of thecompartments 10, they are abraded by the disk 8 and worn smaller and soadvanced along the downward curve of the coi'npartment surface untilthey become sufliciently small to pass under the vanes 29 and reach theedge of the disk 8. A comparatively gentle exhaust current meanwhilecirculating through the channel (3 and also in a clockwise direction. A.draft from the edges of the disk 8 is therefore instituted through theseveral exhaust apertures 26 and the accumulating abraded materialgathered by the exhaust current is swept around the rim channel of thetable and exhausted through the pipe 25 connected to the blower and theblower exhaust 22. Larger scraps or pieces of the ground material whichreach the edge of the disk are not affected by the draft and are.therefore, not carried away through the exhaust, the apertures 26 beingsmall enough to prevent large pieces of the material from being emptiedinto the exhaust channel by the centrifugal action of the abrading disk.

It is by use of the compartment disk cover with its feeding surfaces 30operating in conjunction with the centrifugal motion of the machine thatI have been able to employ the entire surface of single disk at once, inattainment of the objects previously set forth as pertaining to thisinvention.

What I claim is:

1. In a grinding machine. a revoluble abrading disk, and a closedcompartment cover formed with a plurality of surfaces entirely coveringthe disk and curving downwardly to approach the disk in direction of therevolution thereof.

2. In an abrading machine, a grinding disk; and a cover providing aninclosing chamber for said disk; said cover having a plurality ofsloping surfaces approaching the disk in the direction of rotation ofthe latter, the lower portions of the surfaces being connected to theupper portions of adjacent surfaces.

3. In a grinding machine, a revoluble abrading disk; and a cover for thedisk; said cover provided with vane walls defining feeding compartmentsand having sloping surfaces extending between the vane Walls.

4. In a grinding machine, a revoluble abrading disk; a table: and acovermounted on said table to provide an inclosing chamher for the disk; saidcover having vane Walls and sloping surfaces between said vane walls toprovide feeding compartments over the whole surface of the disk.

5. In an abrading machine, a revoluble grinding disk; a table, anexhaust channel carried by said table and arranged circumferentiallybelow said disk; and a stationary cover providing an inclosing chamberfor said disk and supported upon said channel, said cover having slopingsurfaces which have the lower surfaces thereof disposed in proximity tothe disk and have said lower portions connected to the upper portions ofadjacent surfaces.

6. In an abrading machine, a revoluble grinding disk; an exhaust channelprovided with exhaust apertures and arranged circumferentially belowsaid disk; a cover inclosing said disk and having sloping surfacesdisposed adjacent to said exhaust apertures and gradually approachingthe disk in the direction of rotation thereof for gradually feeding amaterial to be ground to the disk.

7. In an abrading machine, a revoluble grinding disk, and a closedinclosing cover for said disk made up of a numberof compartmentsradiating from the central portion of the cover to completely cover thewhole surface of the disk, each of said compartments being formed with acurved wall gradually approaching the surface of the grinding disk inorder that material to be ground may be fed by the curved surfaces toall portions of the grinding disk surface simultaneously.

8. In an abrading machine, a revoluble grinding disk; a cover inclosingsaid disk; vane walls radiating from the central portion of the cover todefine compartments over the entire surface of the disk, each of Copiesof this patent may be obtained for said compartments being formed with acurved feeding wall extending between adj aof the disk and being formedwith a closable feeding aperture.

9. In an abrading machine, a revoluble grinding disk and cover inclosingsaid disk; vane walls radiating from the central portion of the cover todefine compartments over the entire surface of the disk, each of saidcompartments being formed with a curved feeding Wall graduallyapproaching the disk surface in the direction of rotation of the diskand being formed with a closable feeding aperture; and. partitionsadjustable on the vane walls to prevent passage between adjacentcompartments of the material fed into any compartment.

10. In an abrading machine, a revoluble grinding disk; an exhaustchannel circumferentially arranged below said disk; an inclosing coverarranged over said disk; vane walls radiated from the central portion ofsaid cover to define compartments therein; and a feeding wall for eachcompartment formed to gradually slope into proximity with the surface ofthe disk from the top of one vane wall to the bottom of the next vanewall in the direction of rotation of the disk; and a blower adapted topro vide an exhaust current through said channelkto carry off thematerial ground by said dis In testimony whereof I have signed my namein the presence of two subscribing witnesses.

EDWARD NALL. Witnesses ANNA B. NALL, H. J. GINTHER.

five cents each, by addressing the Commissioner of Patents.

Washington, D. G."

